bpf: Sync bpf.h to tools

Sync include/uapi/linux/bpf.h with tools/

Changes
  v1->v2:
  - BPF_F_ADJ_ROOM_MASK moved, no longer in this commit
  v2->v3:
  - BPF_F_ADJ_ROOM_ENCAP_L3_MASK moved, no longer in this commit

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 3c04410..8370245 100644 (file)
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1478,13 +1478,27 @@ union bpf_attr {
  *             Grow or shrink the room for data in the packet associated to
  *             *skb* by *len_diff*, and according to the selected *mode*.
  *
- *             There is a single supported mode at this time:
+ *             There are two supported modes at this time:
+ *
+ *             * **BPF_ADJ_ROOM_MAC**: Adjust room at the mac layer
+ *               (room space is added or removed below the layer 2 header).
  *
  *             * **BPF_ADJ_ROOM_NET**: Adjust room at the network layer
  *               (room space is added or removed below the layer 3 header).
  *
- *             All values for *flags* are reserved for future usage, and must
- *             be left at zero.
+ *             The following flags are supported at this time:
+ *
+ *             * **BPF_F_ADJ_ROOM_FIXED_GSO**: Do not adjust gso_size.
+ *               Adjusting mss in this way is not allowed for datagrams.
+ *
+ *             * **BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 **:
+ *             * **BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 **:
+ *               Any new space is reserved to hold a tunnel header.
+ *               Configure skb offsets and other fields accordingly.
+ *
+ *             * **BPF_F_ADJ_ROOM_ENCAP_L4_GRE **:
+ *             * **BPF_F_ADJ_ROOM_ENCAP_L4_UDP **:
+ *               Use with ENCAP_L3 flags to further specify the tunnel type.
  *
  *             A call to this helper is susceptible to change the underlaying
  *             packet buffer. Therefore, at load time, all checks on pointers
@@ -2624,9 +2638,18 @@ enum bpf_func_id {
 /* Current network namespace */
 #define BPF_F_CURRENT_NETNS            (-1L)
 
+/* BPF_FUNC_skb_adjust_room flags. */
+#define BPF_F_ADJ_ROOM_FIXED_GSO       (1ULL << 0)
+
+#define BPF_F_ADJ_ROOM_ENCAP_L3_IPV4   (1ULL << 1)
+#define BPF_F_ADJ_ROOM_ENCAP_L3_IPV6   (1ULL << 2)
+#define BPF_F_ADJ_ROOM_ENCAP_L4_GRE    (1ULL << 3)
+#define BPF_F_ADJ_ROOM_ENCAP_L4_UDP    (1ULL << 4)
+
 /* Mode for BPF_FUNC_skb_adjust_room helper. */
 enum bpf_adj_room_mode {
        BPF_ADJ_ROOM_NET,
+       BPF_ADJ_ROOM_MAC,
 };
 
 /* Mode for BPF_FUNC_skb_load_bytes_relative helper. */